On a portable power plane, the electric motor powers a cutter head that may measure up to ___ inches wide.

On a portable power plane, the electric motor powers a cutter head that may measure up to ___ inches wide.

• A. 2 1/2
• B. 3
• C. 4
• D. 3 3/4

Answer: (D)

The key idea is that the width of a portable power plane’s cutter head determines how wide a board you can plane in a single pass. The motor drives this cutter head, and the blades slice across a strip of wood that matches the head’s width. So if the cutter head is 3 3/4 inches wide, you can surface up to that width with one pass; anything wider would require multiple passes or a different tool. Why 3 3/4 inches fits as the maximum here: many standard portable planers use a cutter head around that width, which is wide enough to handle common boards efficiently while keeping the tool compact and manageable. Other widths listed are smaller and would limit how much material you remove per pass, making it slower for wide boards, or larger tools would be a different class of planer. In practice, if you’re planing a board wider than the cutter head, you simply take multiple passes, rotating and aligning the board as needed, or use a larger machine for one-pass planing.

The key idea is that the width of a portable power plane’s cutter head determines how wide a board you can plane in a single pass. The motor drives this cutter head, and the blades slice across a strip of wood that matches the head’s width. So if the cutter head is 3 3/4 inches wide, you can surface up to that width with one pass; anything wider would require multiple passes or a different tool.

Why 3 3/4 inches fits as the maximum here: many standard portable planers use a cutter head around that width, which is wide enough to handle common boards efficiently while keeping the tool compact and manageable. Other widths listed are smaller and would limit how much material you remove per pass, making it slower for wide boards, or larger tools would be a different class of planer.

In practice, if you’re planing a board wider than the cutter head, you simply take multiple passes, rotating and aligning the board as needed, or use a larger machine for one-pass planing.